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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc4ce5313682bd9cc60038cc0d98075860d94a8b44ba7a8cdfbd44f2632cf05' 
  AND token = 'INRotoxe6/5pnUxajkbWs5Md+JfBRzM7LjBjFV4zGJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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