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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '075ff7722c0acc2bb31752a3f289ef2b8762de6eff0b5efcd6c10a1e0556cb25' 
  AND token = 'YiQaVyEQr2j8/BDKFZo8UIsFkgPLQN2cMAz2bShifmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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