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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40e616ab8635bcb17e107d2dce9977d5fb30059e4c8730c6d6a2c559d3797a45' 
  AND token = 'cgX7l4t7OKW9eYI11MwzO0Yf5T0PFJ7pH6zknzBTFn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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