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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470cae8587280b9fa282e6ce8da92a764e9034b52aa1636a5fc13aeb62fc8508' 
  AND token = 'Orq3zzIWOH/l24d2Lk115RG+t68bgnB1wVngFuLJ4Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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