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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f8e4857e57a077c0c8cd5cb2b0e548a92185eed2dfdebf691d6f9726cd531e' 
  AND token = 'hBpI1ZT3o6dJ/Pi2m9yn/3+JTbN/sQS7syN0kCMWNQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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