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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '703217b73178f308f37880a3a23f0b24625e959941e5a49d3b8abdb3f8a10054' 
  AND token = 'hj8EG0oUDClf0f8OznI8V3+3umHl386DMR3xTmSGHyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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