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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e2c16041e1ee6300c1f428aa5d28947de04463268993ff887d8c2054b1aea55' 
  AND token = 'qujvbQ9WsrSm1e85powmat5Y7a3R3Kvdk88v+coCwAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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