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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c32e51cd3850b47003e1fcdbf44c348e9f670b3c82ae181cad771fbc7327491b' 
  AND token = 'aetNp3Epc62L2GiZcNCHBC/XKgRFehcFTtz++/YcDxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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