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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e4b5c19ba0aae72b357097860d34190c553f41dc19dd33b106e36db7518194b' 
  AND token = 'RIiPdorgqlHnZWWR1sw2Md61mATLMgyJtzqGJw3A5AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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