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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7ab74757e7d2461bb9bc80a8107a4156af8e54aa3b530038a50debd64ecb91' 
  AND token = 'L2bWsrD+0CSz6+LGakxDK/EyKj10EJ7AUkghwfDVlu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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