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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce71ccd2a4549d90b986ec19f8618fb2c58c059b68e909d05f2d52be08d061e' 
  AND token = 'LUtANtqbbgEjkOFlIhoiocRoG/1sUSV/E2ceitP0AkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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