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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b2dbdc400387e1ebf6bda5c99f30be95a1aee6cd29720c3d0ec73899ec55ea3' 
  AND token = '+RBBy5GG2UqRS+Lrm/4lISRtbRTuk0aAcW9YR8AA6YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00108

JSON explain

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