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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fc18c57c1eb8dd775136ee29332461b653e549839a38337acbb6610d9c1595a' 
  AND token = 'Za5awoltER2MSm1ddZid0adYU7PU0q0ScG2cCRA/H7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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