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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f227c61b98b717c580d2a1bf5b9abc43537f4a7e6f1fbfbb9bb8b171f053b39' 
  AND token = 'ow9pD7iJ7QHOAnB2z8L0E7WkjcNSd3JRf/IsxZqfRhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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