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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd882b11dfe0a098e932f6004280c011cdaf44ea621af1ff199910d458f861a5c' 
  AND token = 'raT/cawZWKkdb1Bii07ykfVAAS4VC6PKVbJsZI2nVi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}