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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb043e2d668911c9b92f1de0a183a9e70ecffd505e42932bceb3390682f5b33' 
  AND token = 'XJCwQS4Q5B3zbLxrPtFDfc7wGdVZTpXI521ZtFloEbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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