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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eb40575bbfae54515f432080fb0e5163fe007a20e2a9dad52d39c7b6a6329ce' 
  AND token = 'uVWsLpSt58EqTqGkG3iWd/r3CDwnDkl7RoBfML//OIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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