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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ed0315591336e0878e5f53cb83ec35fb2de44cffd5b9e19a23df93b4278cba' 
  AND token = '3eUI/tSmA0KOJQ0XHt/NqDqbqZfcRTngnTgmBIUyJuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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