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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb905b3007141d05a7389e32c5133c33312d18114699453dd5012d01198b4da' 
  AND token = '6W3R6ySTc+BRfvfiWYvvQKqszHARUqvF0WPMsZx7BNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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