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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c9d484aa29ba6019102fe7fa06954d5288675091c2f3a61c8bd264b5a5a0990' 
  AND token = 'gaZ29Ep+qQnC60WYakafIHpwdCeFeW1o1G4rPLhdy78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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