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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee4151ab3741a18061e32198c0e7e576dc5e113bbcd7814c6c5fbbb83c896c4' 
  AND token = 'tQ0nZD35zqHNwKF0vzMQ0lghrK3Flm46w9ecpeQwqS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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