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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc76c20a9001a558198eea7fab40de898ffbb0689ed279365ca80a51084572eb' 
  AND token = 'aJqZo7Mc2zwrfyXiXEWpqOFjkUxy+xQcZz9iV9+csA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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