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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c401e07a78f1600af1408d02fd3b0c2c98242538355acfde7fb58e1e53cb127' 
  AND token = '5SkFrHkG893tdKiZYIPFlwCosIt6oDArsIFQ2rN/5yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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