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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6238b2a90130f4a3c78d5eb0f0da24038185aa97708dd6f9030b320cac538fcc' 
  AND token = '0b1S991cVphqD96X9u0xNMaGg8WZK+0P/SDJoFASoAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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