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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd213baa19e1bb1c053d2f7cfb1efa7fca8d538df67a7ac6fb83c798d547b387' 
  AND token = 'dyOI0hmELqJrhTixZbwqOgBbYw9WpgtDIRasiGZugOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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