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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab6252b37f45e82733a0c65909838f6d52c2bea3dedb3ab6b8bf8f939e88028' 
  AND token = '6IRaLc9PIuEd+NczdFUEJMIHnBq8BfUAju+UZ5tnZ7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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