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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5138fc4301d482dcb103ef630553451bad0747dc3945e59d14c8ca78734f4b1' 
  AND token = 'F4cnfvka4Kkk94229YLx6/G7AuWljqb3DO2sUH6Jusc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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