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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '269073ad22f72f2b96a713ddea57534c256246221aab5c79e90096a80a902ece' 
  AND token = 'e+NLXD6bA9+Zq9DnBNNr0wrZCKQ1TOCVoYZB7PP/3FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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