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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d209b3be7631127b17d9c1030ce7def661125120772f004a57b2206d10e4af6' 
  AND token = 'd0o1jvXIayMqUaqjj1jgC9yI963eR54JwUP8UWMHIO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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