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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40b4775cb83fd751a382f7096432842f68239510fe897d356250b861cca1485d' 
  AND token = 'zxvcFuAYk9KE0fxNU3CtNSz8O449OODPpctxNduHUm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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