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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c485d0491072c0642e5373c86a1ceb1922bfab7496f12c74aa9054f36d53e2da' 
  AND token = '4QKmZy5DafY9qZxKW7K9XNjBcvLSX+dp7UX1t0nuC3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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