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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5de3cd5fedb505ea2b1d0833741d99cb84bf328f082be5af70e1f418a8bf6c0' 
  AND token = 'wbaMFPrhDgwlHoe8zsAdo20NQPLeF78KeInysRkmF/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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