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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe70a85f44dbc340150e3c7ffc2b5f0fd7862cb01e338a0a600489e11f9c9f1f' 
  AND token = 'fPDkYYkeMVmFJQVFqaxZAqz+ZrplquUXezwqaLvQ8Nw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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