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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b33dd96bf8449c62b916e973802fa5ef1720e7ccd19968dbf52bfb37494cf9' 
  AND token = 'I2S6JkczAz9utKBdYuYx69sZ2p8BBj/nPDDaIrzWKA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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