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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77e7735a69ee377ed2914aca8fd9a6801374bb41e97fb4b60b9281524693c615' 
  AND token = 'faEc6Bql19Ea77+oKGbg/9+me5rC7IAzoX5rX7VAxjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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