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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cdac8bfcb544a0435ec0836592f0241cf3bb4cfaca2ef929aeffa31395aba1b' 
  AND token = 'UAUDOGkG71KGb1zzdjHOdoObDZdFxQvs6RV81B/yBGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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