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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce8b0a3f7b251d64781fcc96feea6afb49da082c89ab62dd3570015b915a24e5' 
  AND token = 'wJtdAmqMenyA1JckAudjCayJprl8qz2cFBi0eCCSpPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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