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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0bf30f62ea439fec79616fec72e5546e66db3f11d1b435b764f443f0d08513a' 
  AND token = 'S2BWSxeNxtWoujDgesTpeK0iI2kGqbrkp0ElmPKy9Z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00119

JSON explain

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