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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ec74680992d250d8495bfba06885a63590a37e1449d7754fc816b339b8479cd' 
  AND token = '3y9Atb4TxAejuD9V1W0jQ6Z6rHKlIOr3ApZSplIjyDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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