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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa168cc67a937dac6a73fc71999b2727fabb75dc6f05a2f26c4852982a176f9d' 
  AND token = 'VAzKxfsax2UjpAnA5/PQAPpJoe4ual1VtA1Rx/gTcVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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