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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db133a83e6ac907dbd28ccce6f850f22447d13cf07150f51484e158b95891051' 
  AND token = 'kI1kIzu8TgGDwYLdB5tU12YmijeGIwNsLlvbmeyuFrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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