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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8482ea82ac8624d932835fd5a5f0bcb10041a085568395bdb859e67c98154a36' 
  AND token = 'Mi0kCJFO6p3Re3PU8cWSrNrolKRN50bUeKolXCcL5hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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