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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f26550ea0f6ac2dd9d04a0eee9fb0fb92ab0d9937a1c5872a6b6742deab05b65' 
  AND token = '+QZQvYLlawCS7fOJR2aq9E1YF5JGVSjLz4JMK81WHFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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